UISwitch 開關

UISwitch *swt = [[UISwitch alloc] initWithFrame:CGRectMake(0, 30, 100, 50)];
    UIImage *on = [UIImage imageNamed:@"smiley_grin_30"];
    UIImage *off = [UIImage imageNamed:@"smiley_sad_30"];

    //設置on和off圖片,7無效
    swt.onImage = on;
    swt.offImage = off;

    [swt setOn:YES animated:YES];

    [swt addTarget:self action:@selector(change:) forControlEvents:UIControlEventValueChanged];

- (void)change:(UISwitch *)swt
{
    //獲取開關狀態
    //swt.isOn == YES == on
    //swt.isOn == NO  == off
    if (swt.isOn)
    {
        NSLog(@"開");
    }
    else
    {
        NSLog(@"關");
    }
}